Dear SPM Gurus,
I am stuck with an 'Out of memory' problem while estimating the parameters
of a fMRI data set.
The puzzling thing for me is that in the past I have succesfully estimated
the parameters of design matrices of this very same size (3360x3360) and
even larger. So something is different now and I can't figure out what. Perhaps
somebody can give a tip. I have appended below the error message I get on
screen. Maybe in that message there is a hint to my problem.
Thanks a lot in advance,
Jorge
PS:
I am working on a DEC alpha workstation with 1GByte swap space. The maxMem
variable in spm_spm.m is set to 2^25 . I have also tried using 2^23 and
2^29 but it didn't help. In the past 2^25 was fine for this and larger matrix sizes.
While running the estimation I am not using the workstation for other things. It
is quite frustrating to find, after approximately one hour of processing,
that the estimation crashed just before getting to the end.
Message on screen:
*******************
SPM99b: spm_spm (v2.28) 18:49:53 - 01/08/2000
========================================================================
Initialising design space : ...F-contrastsize of MV is:
ans =
3360 3360
Name Size Bytes Class
MV 3360x3360 90316800 double array
V 3360x3360 4856164 sparse array
action 1x4 8 char array
ans 1x2 16 double array
rk 1x1 8 double array
sX 1x1 6123904 struct array
varargin 1x3 7867092 cell array
Grand total is 13238362 elements using 109163992 bytes
Name Size Bytes Class
MV 3360x3360 90316800 double array
action 1x4 8 char array
ans 1x2 16 double array
rk 1x1 8 double array
Grand total is 11289607 elements using 90316832 bytes
...done
Output images : ...initialised
Plane 46/46 , plank 3/3 : ...done
Design parameters : ...V, & traces??? Error while evaluating
uicontrol Callback.
>> ??? Error using ==> .*
Out of memory. Type HELP MEMORY for your options.
Error in ==> /usr/local/spm99/spm_SpUtil.m
On line 470 ==> trRVRV = sum(sum(V.*V)) - 2*sum(sum(V.*MV)) +
sum(sum(MV'.*MV));
Error in ==> /usr/local/spm99/spm_spm.m
On line 897 ==> [xX.trRV,xX.trRVRV] ... %-Variance expectations
-------------------------------------------------------------------
Jorge Jovicich, Dr. rer. nat.
Dept. of Neurology | Computation and Neural Systems
Harbor-UCLA Medical Center | California Institute of Technology
1124 W Carson St. B-4 | 1200 E California Blv., BI 139-74
Torrance, CA 90502, USA | Pasadena, CA 91125, USA
310-222-5656/7 | 626-395-2882
310-222-5658 (fax) | 626-796-8876 (fax)
[log in to unmask] | [log in to unmask]
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